<!DOCTYPE html>
<!--
@license
Copyright 2019 Google LLC

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<html>
<head>
  <meta charset="utf-8">
  <title>Image comparison</title>

  <style>
    html, body {
      height: 100%;
    }
  </style>
  <script type="text/javascript">
    var showOld = false;
    function start() {
      if (sessionStorage) {
        var text = sessionStorage.getItem('imgName');
        if (text) {
          document.getElementById('imgName').value = text;
        }
      } else {
        // MSIE 11 does not support sessionStorage on file:// URLs.
        logEvents(false);
      }
      openImage();
    }
    function openImage() {
      var imgName = document.getElementById('imgName').value;
      if (sessionStorage) {
        sessionStorage.setItem('imgName', imgName);
      }
      var imgElem = document.getElementById('image');
      if (showOld) {
        imgElem.setAttribute('src', './outputs/old/' + imgName + '.png');
        document.getElementById('versionName').innerHTML = 'Old';
      } else {
        imgElem.setAttribute('src', './outputs/new/' + imgName + '.png');
        document.getElementById('versionName').innerHTML = 'New';
      }
    }

    function showDiff() {
      var imgName = document.getElementById('imgName').value;
      var imgElem = document.getElementById('image');
      imgElem.setAttribute('src', './outputs/diff/' + imgName + '.png');
      document.getElementById('versionName').innerHTML = 'Diff';
    }
    function onImageClick() {
      showOld = !showOld;
      openImage();
    }
  </script>
<body onload="start()">
  <textarea id="imgName"></textarea>
  <input type="button" value="open" onclick="openImage()">
  <input type="button" value="show diff" onclick="showDiff()">

  <h1 id="versionName"></h1>
  <br>
  <img id="image" onclick="onImageClick()">
</body>
